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html 代码
<!DOCTYPE html>
<html lang=”en”>
<head>
<meta charset=”UTF-8″ />
<title>solar system</title>
<style>
* {
margin: 0;
padding: 0;
}
html,
body {
width: 100%;
}
#canvas {
width: 100%;
height: 100%;
background: black;
display: block;
/*去掉canvas作为行内元素默认垂直方式而产生的下边空白间距*/
}
</style>
</head>
<body>
<canvas id=”canvas”>your browser do not support canvas</canvas>
<script>
var canvas = document.getElementById(‘canvas’)
var cxt = canvas.getContext(‘2d’)
var centerX = 0,
cneterY = 0
var time = 0
centerX = window.innerWidth / 2
cneterY = window.innerHeight / 2
canvas.width = window.innerWidth
canvas.height = window.innerHeight
window.onresize = function() {
canvas.width = window.innerWidth
canvas.height = window.innerHeight
// 获取浏览器窗口的中心坐标
centerX = window.innerWidth / 2
cneterY = window.innerHeight / 2
// console.log(“W:”+centerX + “H:”+cneterY);
}
function draw() {
cxt.clearRect(0, 0, 10000, 10000)
cxt.strokeStyle = ‘#fff’
//画轨道，因其是相对太阳静止的，故与行星区分开来画
function drawTrack() {
for (var i = 1; i < 9; i++) {
cxt.beginPath()
cxt.arc(centerX, cneterY, 50 * i, 0, 360, false)
cxt.closePath()
cxt.stroke()
}
}
drawTrack()
function Planet(x, y, radius, cycle, inColor, outColor) {
this.x = x
this.y = y
this.radius = radius
this.cycle = cycle
this.inColor = inColor
this.outColor = outColor
this.draw = function() {
cxt.save()
cxt.translate(centerX, cneterY)
cxt.rotate(
(((time * 360) / this.cycle) * Math.PI) / 200,
)
cxt.beginPath()
cxt.arc(this.x, this.y, this.radius, 0, 360, false)
cxt.closePath()
var sunColor = cxt.createRadialGradient(
this.x,
this.y,
0,
this.x,
this.y,
20,
)
sunColor.addColorStop(0, this.inColor)
sunColor.addColorStop(1, this.outColor)
cxt.fillStyle = sunColor
cxt.fill()
cxt.restore()
time++
}
}
var sun = new Planet(0, 0, 20, 0, ‘#f00’, ‘#f90’)
sun.draw()
var Mercury = new Planet(-50, 0, 10, 288, ‘#A69697’, ‘#5C3E40’)
Mercury.draw()
var Venus = new Planet(-100, 0, 10, 505, ‘#C4BBAC’, ‘#1F1315’)
Venus.draw()
var Earth = new Planet(-150, 0, 10, 565, ‘#78B1E8’, ‘#050C12’)
Earth.draw()
var Mars = new Planet(-200, 0, 10, 687, ‘#CEC9B6’, ‘#76422D’)
Mars.draw()
var Jupiter = new Planet(
-250,
0,
10,
4333,
‘#C0A48E’,
‘#322222’,
)
Jupiter.draw()
var Saturn = new Planet(
-300,
0,
10,
10760,
‘#F7F9E3’,
‘#5C4533’,
)
Saturn.draw()
var Uranus = new Planet(
-350,
0,
10,
30099,
‘#A7E1E5’,
‘#19243A’,
)
Uranus.draw()
var Neptune = new Planet(
-400,
0,
10,
165 * 320,
‘#0661B2’,
‘#1E3B73’,
)
Neptune.draw()
}
setInterval(draw, 10)
</script>
</body>
</html>
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